1/5th of the price? If you have the right setup it's closer to 1/64 depending on what you print. There are 1:1 Photogrammetry scans for most of the models if you know where to look or proxies that match the rest of the range.

The problem is mostly the 3D printing itself and that's from someone who printed a full 2000pts Lumineth army for Warhammer. The resins are pretty gnarly and you need to have a dedicated exhaust system or a room you don't step in because of the VOCs. The parts are also consumable (FEP films, LCD screens, etc) and you need to take apart the printers to replace them and they're not cheap.

It's a fantastic tool but it's far from threatening Game Workshop's stock, at least in its current stage.